At present, high chromium cast iron has a certain toughness after the high hardness of white cast iron. High chromium white alloy cast iron is a kind of high temperature wear-resistant cast iron. The addition of Cr can improve the wear resistance of cast iron, because Cr can form a dense protective film Cr2O3 on the casting surface. Adding chromium will also produce carbides, thus improving the hardness and strength of cast iron. High chromium cast iron can be used to manufacture wear-resistant parts working at high temperature above 800℃. It has been applied in many fields. High chromium cast iron has high wear resistance, so it is widely used in mining machinery industry, especially the parts of slurry pump, such as pump body, impeller and guard plate (including common materials: Cr 15Mo3, Cr 15Mo2Cu, KmTBCr 12, Cr20 Cr26 high chromium alloy cast iron and wear-resistant white cast iron). Valin brand in Zhengzhou introduced BN-K 1 blade, which is used to turn high-chromium wear-resistant and high-hardness iron castings, which can make up for the performance of cemented carbide tool coating, and is used for wear resistance and impact resistance of welding tools and high-chromium iron castings. Zhengzhou Valin brand tool material BN-K 1, when turning high chromium alloy castings, the performance of the blade is reflected in high hardness, strong impact resistance, good toughness, good red hardness, high wear resistance and bending strength.

Parameters of mud pump body (KmTBCr26) for cutting high chromium alloy castings: linear velocity Vc=70-90m/min, feed Fr=0. 15-0.35mm/r, and tool depth ap=2-5mm.